Basically I'm stuck on the whole of the first page of this practice paper. I have done all the rest. If someone could help me with the first page, upload through a word document or something? Ill even pay! Its driving me mad.

Thanks :)

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Originally Posted by thinkdougie

Basically im stuck on the whole of the first page of this practice paper. I have done all the rest. If someone could help me with the first page, upload through a word document or something? Ill even pay! Its driving me mad.

Thanks :)

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I have no idea what you are asking. What question? What paper?

1. In the production of soya bean oil, the oil is extracted from the original
Beans using hexane as solvent. The soya beans contain 12% w/w oil, the
Rest being insoluble bean waste. 500 kg min–1 of soya beans are to be
Extracted. The bean waste leaving the process (known as raffinate)
Contains 0.5% w/w oil and 2% w/w hexane. The extract is 22% w/w oil
And the rest is hexane. No bean waste leaves with the extract.
The extract is then passed to a distillation column which separates the mix
Into pure hexane, which is recycled back to the extractor for reuse, and
98.5% oil as final product. Hexane losses are made up by continuous
Make up from the hexane storage system.
(a) Draw a block diagram of the process incorporating all the
Information given in the question.
(b) Calculate (in kg min–1):
(I) the amount of extract leaving the extractor
(ii) the amount of hexane required in the extraction stage
(iii) the amount of both streams leaving the distillation stage
(iv) the amount of hexane make-up required to ensure the process is
Steady state.
Check your answer by carrying out an additional balance not already
Used in your calculation.


The upload didn't happen. Here is the question I'm stuck on.